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e9487f0dc8
not define a value that is used outside of it's block. This catches many more simplifications, e.g. 854 in 176.gcc, 137 in vpr, etc. This implements branch-phi-thread.ll:test3.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23397 91177308-0d34-0410-b5e6-96231b3b80d8